git ssb

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var once = require('once');
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var noop = function() {};
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var isRequest = function(stream) {
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	return stream.setHeader && typeof stream.abort === 'function';
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};
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var isChildProcess = function(stream) {
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	return stream.stdio && Array.isArray(stream.stdio) && stream.stdio.length === 3
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};
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var eos = function(stream, opts, callback) {
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	if (typeof opts === 'function') return eos(stream, null, opts);
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	if (!opts) opts = {};
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	callback = once(callback || noop);
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	var ws = stream._writableState;
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	var rs = stream._readableState;
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	var readable = opts.readable || (opts.readable !== false && stream.readable);
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	var writable = opts.writable || (opts.writable !== false && stream.writable);
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	var onlegacyfinish = function() {
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		if (!stream.writable) onfinish();
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	};
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	var onfinish = function() {
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		writable = false;
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		if (!readable) callback.call(stream);
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	};
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	var onend = function() {
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		readable = false;
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		if (!writable) callback.call(stream);
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	};
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	var onexit = function(exitCode) {
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		callback.call(stream, exitCode ? new Error('exited with error code: ' + exitCode) : null);
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	};
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	var onerror = function(err) {
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		callback.call(stream, err);
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	};
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	var onclose = function() {
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		if (readable && !(rs && rs.ended)) return callback.call(stream, new Error('premature close'));
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		if (writable && !(ws && ws.ended)) return callback.call(stream, new Error('premature close'));
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	};
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	var onrequest = function() {
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		stream.req.on('finish', onfinish);
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	};
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	if (isRequest(stream)) {
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		stream.on('complete', onfinish);
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		stream.on('abort', onclose);
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		if (stream.req) onrequest();
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		else stream.on('request', onrequest);
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	} else if (writable && !ws) { // legacy streams
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		stream.on('end', onlegacyfinish);
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		stream.on('close', onlegacyfinish);
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	}
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	if (isChildProcess(stream)) stream.on('exit', onexit);
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	stream.on('end', onend);
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	stream.on('finish', onfinish);
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	if (opts.error !== false) stream.on('error', onerror);
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	stream.on('close', onclose);
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	return function() {
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		stream.removeListener('complete', onfinish);
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		stream.removeListener('abort', onclose);
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		stream.removeListener('request', onrequest);
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		if (stream.req) stream.req.removeListener('finish', onfinish);
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		stream.removeListener('end', onlegacyfinish);
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		stream.removeListener('close', onlegacyfinish);
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		stream.removeListener('finish', onfinish);
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		stream.removeListener('exit', onexit);
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		stream.removeListener('end', onend);
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		stream.removeListener('error', onerror);
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		stream.removeListener('close', onclose);
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	};
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};
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module.exports = eos;
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